Something very strange...

[inilim]

$a = new \Vrzno;
var_dump(($type = \getVrznoType($a->__php_action)) === \getVrznoType($a->__php_action)); // false
var_dump($type); // WindowPhpActionS
var_dump(($type = \getVrznoType($a->__php_action)) === \getVrznoType($a->__php_action)); // true
var_dump($type); // WindowPhpAct
var_dump(($type = \getVrznoType($a->__php_action)) === \getVrznoType($a->__php_action)); // true
var_dump($type); // WindowPhpActionService
var_dump(($type = \getVrznoType($a->__php_action)) === \getVrznoType($a->__php_action)); // true
var_dump($type); // WindowPhpActionService

The names of js objects can be obtained via print_r or var_dump.

function getVrznoType(object $obj): string
{
    if ($obj::class === \Vrzno::class) {
        $value = \print_r($obj, true);
        $value = \trim($value);
        \preg_match('/^([a-z]+)/i', $value, $m);
        return $m[0] ?? '';
    }
    return $obj::class;
}

window.__php_action = new WindowPhpActionService;

I use https://cdn.jsdelivr.net/npm/php-wasm@0.0.8/PhpWeb.mjs

what is the stable version at the moment?

[inilim]

When the page is refreshed, the result changes periodically.

bool(true)
string(22) "WindowPhpActionService"
bool(true)
string(12) "WindowPhpAct"
bool(false)
string(12) "WindowPhpAct"
bool(true)
string(12) "WindowPhpAct"

[inilim]

print_r($a->__php_action);
print_r($a->__php_action);
print_r($a->__php_action);
print_r($a->__php_action);
print_r($a->__php_action);
print_r($a->__php_action);
print_r($a->__php_action);
print_r($a->__php_action);
print_r($a->__php_action);

output

WindowPhpActionS`6T Object
(
)
WindowPhpAct; Object
(
)
WindowPhpActionService Object
(
)
WindowPhpActionService Object
(
)
WindowPhpActionService Object
(
)
WindowPhpActionService Object
(
)
WindowPhpActionService Object
(
)
WindowPhpActionService Object
(
)
WindowPhpActionService Object
(
)